Dota 2 players found their matchmaking score erased as Valve introduced on August 6 an experimental matchmaking system developed towards the team play core aspect of the game. The MMR numbers are erased but the Medal earned so far in the season stays in place. The new update focuses on two big aspects: the removal of the two types of MMRs, party and solo and the addition of role MMR. While Valve are aware that the first concept will raise the most controversy in the community, the latter is actually something that the players have been hoping to see implemented for a long time now. Most of the issues related to this we think we can solve with better algorithms. Another common case is playing with a friend who has a higher mmr than you, expecting that it will cause your mmr to go higher. While that has been at least partly true in previous matchmaking system iterations, our most recent version does a fairly good job of addressing this. We have enough data to form matches that cause you to have an even chance to win by carefully choosing the opponents that have a similar makeup. At a base level, we think mathematically we are able to have high confidence that playing with a friend will not have a material effect on your average mmr value with a properly balanced matchmaker.
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